Manual Reference Pages - DBIX::CLASS::STORAGE::DBI::ADO::MICROSOFT_SQL_SERVER (3)
DBIx::Class::Storage::DBI::ADO::Microsoft_SQL_Server - Support for Microsoft
SQL Server via DBD::ADO
This subclass supports MSSQL server connections via DBD::ADO.
The MSSQL specific functionality is provided by
_identity_method is set to @@identity, as SCOPE_IDENTITY() doesnt work
with DBD::ADO. See IMPLEMENTATION NOTES in DBIx::Class::Storage::DBI::MSSQL
for caveats regarding this.
There is a bug with MSSQL ADO providers where data gets truncated based on the
size of the bind sizes in the first prepare call:
The ado_size workaround is used (see ADO providers in DBD::ADO) with the
approximate maximum size of the data_type of the bound column, or 8000 (maximum
VARCHAR size) if the data_type is not available.
Please report problems with this driver and send patches.
LongReadLen is set to LongReadLen * 2 + 1 on connection as it is necessary
for some LOB types. Be aware of this if you localize this value on the $dbh
Due perhaps to the ado_size workaround we use, and/or other reasons, binary data
such as varbinary column data comes back padded with trailing NULL chars.
The Cursor class for this driver
(DBIx::Class::Storage::DBI::ADO::Microsoft_SQL_Server::Cursor) removes them,
of course if your binary data is actually NULL padded that may be an issue to
keep in mind when using this driver.
uniqueidentifier columns come back from ADO wrapped in braces and must be
submitted to the MSSQL ADO driver wrapped in braces. We take care of this
transparently in this driver and the associated Cursor class
(DBIx::Class::Storage::DBI::ADO::Microsoft_SQL_Server::Cursor) so that you
dont have to use braces in most cases (except in literal SQL, in those cases
you will have to add the braces yourself.)
Fractional seconds with DBIx::Class::InflateColumn::DateTime are not
currently supported, datetimes are truncated at the second.
Check the list of additional DBIC resources.
COPYRIGHT AND LICENSE
This module is free software copyright
by the DBIx::Class (DBIC) authors. You can
redistribute it and/or modify it under the same terms as the
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